Question

i) What is meant by scattering of light ?
ii) Mention the factor on which it depends. Explain why the colour of the clear sky is blue
iii) An Astronaut in space finds sky to be dark.Explain reason for this observation

Answer 1

Answer:

scattering of lights means when light passes through path and we can see dust particles present in that light.

2.it is because wavelength of blue colour is equal to dust particles present in the atmosphere hence blue light scatters towards the Earth and other lights scatters different directions. thus clear sky seems blue in colour.

3.this is because due to absence of molecules (dust particles) in air the scattering of a light does not take place .thus sky appears dark in the absences of scattering and astronaut finds sky to be dark.

Answer 2

Answer:

Bouncing of light by the particle of the medium is known as Scattering of light.

Condition for scattering is size of particles should be small as comapare to wavelength of light.

The colour of sky is blue because sky consists of air molecules and size of air molecules is comparable with the blue colour so blue colour is scattered out anh hence sky appears blue.

The sky appears dark instead of blue to an astronaut because there is no atmosphere in the outer space that can scatter the sunlight. Hence, no sunlight is scattered out, no scattered light reach to the eyes of astronaut. Therefore, sky appears dark instead of blue to an astronaut.

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